JP2004308920A - Dynamic pressure type bearing device - Google Patents

Dynamic pressure type bearing device Download PDF

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Publication number
JP2004308920A
JP2004308920A JP2004220659A JP2004220659A JP2004308920A JP 2004308920 A JP2004308920 A JP 2004308920A JP 2004220659 A JP2004220659 A JP 2004220659A JP 2004220659 A JP2004220659 A JP 2004220659A JP 2004308920 A JP2004308920 A JP 2004308920A
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bearing
thrust
dynamic pressure
housing
shaft
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JP2004220659A
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Natsuhiko Mori
夏比古 森
Shigeki Matsushita
茂樹 松下
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure capable of simplifying assembling processes and capable of easily and accurately setting a clearance of a thrust bearing in a thrust bearing part. <P>SOLUTION: This dynamic pressure type bearing device is provided with a radial bearing part, which is provided between the outer peripheral surface of a shaft part of a shaft member and the inner peripheral surface of a bearing member to support the shaft part with the work of the dynamic pressure of the lubricating oil generated in a clearance of the radial bearing without touching it, and a thrust bearing part, which is provided between both end surfaces of a thrust plate of the shaft member and an end surface of the bearing member and the inner surface of a bottom part of a housing to support the thrust plate in the thrust direction with the work of the dynamic pressure of the lubricating oil generated in a clearance of the thrust bearing without touching it. The bearing member is fixed to the predetermined position of the inner peripheral surface of the housing, and since axial dimension between the end surface of the bearing member and the inner surface of the bottom part of the housing is formed at a constant dimension, a clearance of the thrust bearing is set at the predetermined value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、動圧型軸受装置に関する。この動圧型軸受装置は、特に情報機器、例えばＨＤＤ、ＦＤＤ等の磁気ディスク装置、ＣＤ−ＲＯＭ、ＤＶＤ−ＲＯＭ等の光ディスク装置、ＭＤ、ＭＯ等の光磁気ディスク装置などのスピンドルモータ、あるいはレーザビームプリンタ（ＬＢＰ）のポリゴンスキャナモータなどのスピンドル支持用として好適である。   The present invention relates to a dynamic pressure bearing device. This dynamic pressure type bearing device is used especially for information equipment, for example, a magnetic disk device such as HDD and FDD, an optical disk device such as CD-ROM and DVD-ROM, a spindle motor such as a magneto-optical disk device such as MD and MO, or a laser beam. It is suitable for supporting a spindle such as a polygon scanner motor of a printer (LBP).

上記各種情報機器のスピンドルモータには、高回転精度の他、高速化、低コスト化、低騒音化などが求められている。これらの要求性能を決定づける構成要素の一つに当該モータのスピンドルを支持する軸受があり、近年では、この種の軸受として、上記要求性能に優れた特性を有する動圧型軸受の使用が検討され、あるいは実際に使用されている。   The spindle motors of the various information devices are required to have high rotational accuracy, high speed, low cost, low noise, and the like. One of the components that determine the required performance is a bearing that supports the spindle of the motor.In recent years, as this type of bearing, the use of a dynamic pressure bearing having characteristics excellent in the required performance has been studied. Or it is actually used.

例えば、ＨＤＤ等のディスク装置のスピンドルモータに組込まれる動圧型軸受装置では、軸部材をラジアル方向に回転自在に非接触支持するラジアル軸受部と、軸部材をスラスト方向に回転自在に非接触支持するスラスト軸受部とが設けられ、これら軸受部として、軸受面に動圧発生用の溝（動圧溝）を有する動圧型軸受が用いられる。ラジアル軸受部の動圧溝は、ハウジングや軸受部材の内周面（ラジアル軸受面）又は軸部材の外周面に形成され、スラスト軸受部の動圧溝は、軸部材に設けられたスラスト板の両端面、又は、これに対向する面（スラスト軸受面）にそれぞれ形成される（例えば、特許文献１）。
特開平１１−２３０１６１号公報 For example, in a dynamic pressure bearing device incorporated in a spindle motor of a disk device such as an HDD, a radial bearing portion that rotatably supports a shaft member in a radial direction in a non-contact manner, and supports a shaft member in a non-contact manner so as to be rotatable in a thrust direction. A thrust bearing portion is provided, and a dynamic pressure bearing having a groove (dynamic pressure groove) for generating dynamic pressure on a bearing surface is used as the bearing portion. The dynamic pressure groove of the radial bearing portion is formed on the inner peripheral surface (radial bearing surface) of the housing or the bearing member or the outer peripheral surface of the shaft member. The dynamic pressure groove of the thrust bearing portion is formed on the thrust plate provided on the shaft member. It is formed on both end surfaces or on a surface (thrust bearing surface) opposed thereto (for example, Patent Document 1).
JP-A-11-230161

本発明の目的は、この種の動圧型軸受装置において、組立工程を簡素化すると共に、スラスト軸受部のスラスト軸受隙間を簡易かつ精度良く設定することができる構成を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a dynamic pressure bearing device of this type that simplifies an assembling process and provides a simple and accurate setting of a thrust bearing gap of a thrust bearing portion.

上記目的を達成するため、本発明は、円筒状の側部と、該側部の一端側部分に装着された蓋部材で構成される底部とを有するハウジングと、軸部と、該軸部に設けられたスラスト板とを有する軸部材と、ハウジングの内周面の所定位置に固定された軸受部材と、軸部材の軸部の外周面と軸受部材の内周面との間に設けられ、ラジアル軸受隙間に発生する潤滑油の動圧作用で軸部をラジアル方向に非接触支持するラジアル軸受部と、軸部材のスラスト板の両端面と、軸受部材の端面及びハウジングの底部の内面との間に設けられ、スラスト軸受隙間に発生する潤滑油の動圧作用でスラスト板をスラスト方向に非接触支持するスラスト軸受部とを備え、軸受部材の端面とハウジングの底部の内面との間の軸方向寸法が定寸に形成されていることにより、スラスト軸受隙間が所定値に設定されている動圧型軸受装置を提供する。   In order to achieve the above object, the present invention provides a housing having a cylindrical side portion, a bottom portion including a lid member attached to one end portion of the side portion, a shaft portion, and a shaft portion. A shaft member having a thrust plate provided, a bearing member fixed at a predetermined position on an inner peripheral surface of the housing, and a shaft member provided between an outer peripheral surface of a shaft portion of the shaft member and an inner peripheral surface of the bearing member; Radial bearings that support the shaft part in a non-contact manner in the radial direction by the dynamic pressure action of the lubricating oil generated in the radial bearing gap, both end surfaces of the thrust plate of the shaft member, the end surface of the bearing member and the inner surface of the bottom of the housing. A thrust bearing portion provided between the thrust bearing and the thrust plate in a non-contact manner in a thrust direction by a dynamic pressure action of lubricating oil generated in a thrust bearing gap, and a shaft between an end surface of the bearing member and an inner surface of a bottom portion of the housing. That the directional dimension is formed to a fixed size Ri, provides a dynamic pressure type bearing device thrust bearing gap is set to a predetermined value.

本発明によれば、組立工程を簡素化すると共に、スラスト軸受部のスラスト軸受隙間を簡易かつ精度良く設定することができ、それによって、この種の動圧型軸受装置の優れた軸受性能を確保しつつ、製造コストをさらに低減させることができる。   ADVANTAGE OF THE INVENTION According to this invention, while simplifying an assembly process, the thrust bearing clearance of a thrust bearing part can be set easily and accurately, and the outstanding bearing performance of this kind of dynamic pressure type bearing device is ensured. In addition, the manufacturing cost can be further reduced.

以下、本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described.

図１は、本発明の実施形態に係る動圧型軸受装置１を組み込んだ情報機器用スピンドルモータの一構成例を示している。このスピンドルモータは、ＨＤＤ等のディスク駆動装置に用いられるもので、軸部材２を回転自在に非接触支持する動圧型軸受装置１と、軸部材２に装着されたディスクハブ３と、半径方向のギャップを介して対向させたモータステータ４およびモータロータ５とを備えている。ステータ４はケーシング６の外周に取付けられ、ロータ５はディスクハブ３の内周に取付けられる。動圧型軸受装置１のハウジング７は、ケーシング６の内周に装着される。ディスクハブ３には、磁気ディスク等のディスクＤが一又は複数枚保持される。ステータ４に通電すると、ステータ４とロータ５との間の電磁力でロータ５が回転し、それによって、ディスクハブ３および軸部材２が一体となって回転する。   FIG. 1 shows an example of a configuration of a spindle motor for information equipment incorporating a dynamic pressure bearing device 1 according to an embodiment of the present invention. This spindle motor is used in a disk drive device such as an HDD, and includes a dynamic pressure bearing device 1 that rotatably supports a shaft member 2 in a non-contact manner, a disk hub 3 mounted on the shaft member 2, The motor includes a motor stator 4 and a motor rotor 5 opposed to each other via a gap. The stator 4 is attached to the outer periphery of the casing 6, and the rotor 5 is attached to the inner periphery of the disk hub 3. The housing 7 of the dynamic pressure bearing device 1 is mounted on the inner periphery of the casing 6. The disk hub 3 holds one or more disks D such as magnetic disks. When the stator 4 is energized, the rotor 5 rotates by the electromagnetic force between the stator 4 and the rotor 5, whereby the disk hub 3 and the shaft member 2 rotate integrally.

図２は、動圧型軸受装置１を示している。動圧型軸受装置１は、ハウジング７と、ハウジング７の内周面７ａに固定された円筒状の軸受部材８と、軸部材２とを主要な構成要素とする。   FIG. 2 shows the dynamic pressure bearing device 1. The dynamic pressure bearing device 1 includes a housing 7, a cylindrical bearing member 8 fixed to an inner peripheral surface 7a of the housing 7, and the shaft member 2 as main components.

ハウジング７は、円筒状の側部７ｂと、底部７ｃと、側部７ｂの上端から内径側に連続して延びた環状の鍔部７ｅとで構成され、側部７ｂの内周面７ａは上端から下端にかけて同一内径に形成される。底部７ｃは、側部７ｂおよび鍔部７ｅとは別体の蓋部材で構成される。この実施形態において、底部７ｃは、側部７ｂの下端部分に設けられた段状の装着部７ｂ１に装着され、接着剤等で固定される。底部７ｃとなる蓋部材の上端面が装着部７ｂ１の段差面７ｂ２と当接することによって、底部７ｃの内面７ｃ１の位置が決まる。鍔部７ｅの内周面７ｅ１は、軸部材２の軸部２ａの外周面と僅かなシール隙間Ｓ６を介して対向する。また、鍔部７ｅの内面７ｅ２は、軸受部材８の上端面８ｃと密着する。この鍔部７ｅによって、ハウジング７内がシールされ、油の漏れ出しが防止される。   The housing 7 includes a cylindrical side portion 7b, a bottom portion 7c, and an annular flange portion 7e extending continuously from the upper end of the side portion 7b to the inner diameter side. The inner peripheral surface 7a of the side portion 7b has an upper end. From the lower end to the lower end. The bottom part 7c is configured by a lid member separate from the side part 7b and the flange part 7e. In this embodiment, the bottom part 7c is mounted on a step-like mounting part 7b1 provided at the lower end of the side part 7b, and is fixed with an adhesive or the like. The position of the inner surface 7c1 of the bottom portion 7c is determined by the upper end surface of the lid member serving as the bottom portion 7c abutting on the step surface 7b2 of the mounting portion 7b1. The inner peripheral surface 7e1 of the flange portion 7e faces the outer peripheral surface of the shaft portion 2a of the shaft member 2 via a small seal gap S6. The inner surface 7e2 of the flange 7e is in close contact with the upper end surface 8c of the bearing member 8. The inside of the housing 7 is sealed by the flange portion 7e, and leakage of oil is prevented.

軸部材２は、軸部２ａと、軸部２ａに一体又は別体に設けられたスラスト板２ｂとを備えている。スラスト板２ｂの幅寸法はＷ１である。軸部２ａは、軸受部材８の内周面８ａに所定のラジアル軸受隙間Ｓ５をもって挿入され、鍔部７ｅの内周面７ｅ１にシール隙間Ｓ６をもって挿入される。スラスト板２ｂは、軸受部材８の下端面８ｂと底部７ｃの内面７ｃ１との間の空間部に収容される。スラスト板２ｂの上端面２ｂ１と軸受部材８の下端面８ｂとの間、および、スラスト板２ｂの下端面２ｂ２と底部７ｃの内面７ｃ１との間には、それぞれ、所定の大きさをもったスラスト軸受隙間Ｓ３、Ｓ４が設けられる。   The shaft member 2 includes a shaft portion 2a and a thrust plate 2b provided integrally with or separately from the shaft portion 2a. The width of the thrust plate 2b is W1. The shaft portion 2a is inserted into the inner peripheral surface 8a of the bearing member 8 with a predetermined radial bearing gap S5, and is inserted into the inner peripheral surface 7e1 of the flange portion 7e with a seal gap S6. The thrust plate 2b is housed in a space between the lower end surface 8b of the bearing member 8 and the inner surface 7c1 of the bottom 7c. Thrusts each having a predetermined size are provided between the upper end surface 2b1 of the thrust plate 2b and the lower end surface 8b of the bearing member 8, and between the lower end surface 2b2 of the thrust plate 2b and the inner surface 7c1 of the bottom 7c. Bearing gaps S3 and S4 are provided.

軸受部材８は、例えば多孔質材、特に燒結金属で形成され、その内部の気孔に潤滑油又は潤滑グリースが含浸されて含油軸受とされる。軸受部材８の内周面８ａの、ラジアル軸受面となる領域には動圧溝が形成される。軸部材２が回転すると、ラジアル軸受隙間Ｓ５に動圧作用が発生し、軸部材２の軸部２ａがラジアル軸受隙間Ｓ５内に形成される潤滑油の油膜によってラジアル方向に回転自在に非接触支持される。これにより、軸部材２をラジアル方向に回転自在に非接触支持するラジアル軸受部１１が構成される。尚、動圧溝は、軸部材２の軸部２ａの外周面に形成しても良い。   The bearing member 8 is made of, for example, a porous material, particularly a sintered metal, and its pores are impregnated with lubricating oil or lubricating grease to form an oil-impregnated bearing. A dynamic pressure groove is formed in a region of the inner peripheral surface 8a of the bearing member 8 to be a radial bearing surface. When the shaft member 2 rotates, a dynamic pressure action is generated in the radial bearing gap S5, and the shaft portion 2a of the shaft member 2 is rotatably and non-contactly supported in the radial direction by an oil film of the lubricating oil formed in the radial bearing gap S5. Is done. As a result, a radial bearing 11 that supports the shaft member 2 rotatably in the radial direction in a non-contact manner is configured. The dynamic pressure groove may be formed on the outer peripheral surface of the shaft portion 2a of the shaft member 2.

スラスト板２ｂの上端面２ｂ１又は軸受部材８の下端面８ｂ、および、スラスト板２ｂの下端面２ｂ２又はハウジング７の内面７ｃ１の、スラスト軸受面となる領域には、それぞれ動圧溝が形成される。軸部材２が回転すると、スラスト軸受隙間Ｓ３およびＳ４に動圧作用が発生し、軸部材２のスラスト板２ｂがスラスト軸受隙間Ｓ３、Ｓ４内に形成される潤滑油の油膜によってスラスト方向に回転自在に非接触支持される。これにより、軸部材２をスラスト方向に回転自在に非接触支持するスラスト軸受部１２が構成される。   Dynamic pressure grooves are respectively formed in the upper end surface 2b1 of the thrust plate 2b or the lower end surface 8b of the bearing member 8, and the lower end surface 2b2 of the thrust plate 2b or the inner surface 7c1 of the housing 7, which are to be the thrust bearing surfaces. . When the shaft member 2 rotates, a dynamic pressure action is generated in the thrust bearing gaps S3 and S4, and the thrust plate 2b of the shaft member 2 is rotatable in the thrust direction by an oil film of the lubricating oil formed in the thrust bearing gaps S3 and S4. Is supported in a non-contact manner. As a result, a thrust bearing portion 12 that rotatably supports the shaft member 2 in the thrust direction in a non-contact manner is configured.

ラジアル軸受面およびスラスト軸受面の動圧溝形状は任意に選択することができ、公知のへリングボーン型、スパイラル型、ステップ型、多円弧型等の何れかを選択し、あるいはこれらを適宜組合わせて使用することができる。   The shape of the dynamic pressure groove on the radial bearing surface and the thrust bearing surface can be arbitrarily selected, and any of the well-known herringbone type, spiral type, step type, multi-arc type, or the like is selected, or these are appropriately assembled. Can be used together.

この実施形態の動圧型軸受装置１は、以下に説明する工程で組立てられる。   The dynamic pressure bearing device 1 of this embodiment is assembled in the steps described below.

まず、図３に示すように、ハウジング７の下端開口側（装着部７ｂ１の側）から軸受部材８を入れ、内周面７ａに沿って鍔部７ｅの内面７ｅ２に当接するまで押し込む。これにより、装着部７ｂ１の段差面７ｂ２に対する軸受部材８の下端面８ｂの位置が定寸位置Ｗに決まる。この状態で、軸受部材８をハウジング７の内周面７ａに固定する。固定方法としては、圧入、接着等がある。従って、軸受部材８の下端面８ｂと装着部７ｂ１の段差面７ｂ２との間の軸方向寸法Ｗを、スラスト板２ｂの幅寸法Ｗ１に両側のスラスト軸受隙間Ｓ３、Ｓ４の値を加えた値に管理しておけば｛Ｗ＝Ｗ１＋（Ｓ３＋Ｓ４）｝、スラスト軸受隙間Ｓ３、Ｓ４を簡易かつ精度良く設定することができる。あるいは、軸受部材８をハウジング７の内周面７ａに固定した後、軸受部材８の下端面８ｂの位置を基準として、装
着部７ｂ１の加工を行っても良い。そうすることで、軸受部材８の下端面８ｂと装着部７ｂ１の段差面７ｂ２との間の軸方向寸法Ｗを正確に決めることができる。尚、軸受部材８をハウジング７の内周面７ａに接着剤で固定する場合、鍔部７ｅの側を下にした状態で、軸受部材８とハウジング７との接着部位に接着剤を充填するようにすると、充填時に接着剤がスラスト軸受部に流れ込む不都合を防止することができる。 First, as shown in FIG. 3, the bearing member 8 is inserted from the lower end opening side of the housing 7 (the side of the mounting portion 7b1), and is pushed along the inner peripheral surface 7a until it comes into contact with the inner surface 7e2 of the flange portion 7e. Thereby, the position of the lower end surface 8b of the bearing member 8 with respect to the step surface 7b2 of the mounting portion 7b1 is determined to the fixed size position W. In this state, the bearing member 8 is fixed to the inner peripheral surface 7a of the housing 7. As a fixing method, there are press-fitting, bonding and the like. Accordingly, the axial dimension W between the lower end surface 8b of the bearing member 8 and the step surface 7b2 of the mounting portion 7b1 is set to a value obtained by adding the values of the thrust bearing gaps S3 and S4 on both sides to the width dimension W1 of the thrust plate 2b. If it is managed, {W = W1 + (S3 + S4)}, and the thrust bearing gaps S3 and S4 can be set simply and accurately. Alternatively, after the bearing member 8 is fixed to the inner peripheral surface 7a of the housing 7, the mounting portion 7b1 may be processed based on the position of the lower end surface 8b of the bearing member 8 as a reference. By doing so, the axial dimension W between the lower end surface 8b of the bearing member 8 and the step surface 7b2 of the mounting portion 7b1 can be accurately determined. When the bearing member 8 is fixed to the inner peripheral surface 7a of the housing 7 with an adhesive, the adhesive is filled into the bonding portion between the bearing member 8 and the housing 7 with the side of the flange 7e facing down. By doing so, it is possible to prevent inconvenience that the adhesive flows into the thrust bearing portion during filling.

つぎに、ハウジング７の下端開口側（装着部７ｂ１の側）から軸部材２を挿入する。この時、図４に示すように、スラスト板２ｂの上端面２ｂ１を軸受部材８の下端面８ｂに当接させ、スラスト板２ｂの下端面２ｂ１と装着部７ｂ１の段差面７ｂ２との間の軸方向寸法を計測することで、スラスト軸受隙間Ｓ３およびＳ４（Ｓ３＋Ｓ４）を正確に管理することができる。   Next, the shaft member 2 is inserted from the lower end opening side of the housing 7 (the side of the mounting portion 7b1). At this time, as shown in FIG. 4, the upper end surface 2b1 of the thrust plate 2b is brought into contact with the lower end surface 8b of the bearing member 8, and the shaft between the lower end surface 2b1 of the thrust plate 2b and the step surface 7b2 of the mounting portion 7b1. By measuring the dimension in the direction, the thrust bearing gaps S3 and S4 (S3 + S4) can be accurately managed.

上記のようにして、ハウジング７に軸受部材８と軸部材２を組み込み、装着部７ｂ１に底部７ｃを固定した後、ハウジング７内を潤滑油で満たすと、図１に示す動圧型軸受装置１が得られる。   After the bearing member 8 and the shaft member 2 are assembled into the housing 7 as described above, and the bottom portion 7c is fixed to the mounting portion 7b1, the inside of the housing 7 is filled with lubricating oil, whereby the dynamic pressure bearing device 1 shown in FIG. can get.

この実施形態のスピンドルモータの動圧型軸受装置１は、ハウジング７に一体に設けられた鍔部７ｅがシールの役割を果たすので、別体のシール部材を配設する必要がなく、その分、部品点数を削減することができる。また、全ての部品をハウジング７の片側（装着部７ｂ１の側）から組込むことができるので、組立作業の効率が良い。さらに、各部品の単体精度を管理することで、スラスト軸受隙間を簡易かつ精度良く設定することができる。   In the dynamic pressure bearing device 1 of the spindle motor of this embodiment, the flange 7e provided integrally with the housing 7 serves as a seal, so that it is not necessary to provide a separate seal member, and the parts Points can be reduced. Also, since all parts can be assembled from one side of the housing 7 (the side of the mounting portion 7b1), the efficiency of the assembling work is high. Further, by managing the unit accuracy of each component, the thrust bearing gap can be easily and accurately set.

本発明の実施形態に係る動圧型軸受装置を有するスピンドルモータの断面図である。1 is a sectional view of a spindle motor having a dynamic pressure bearing device according to an embodiment of the present invention. 本発明の実施形態に係る動圧型軸受装置を示す断面図である。It is a sectional view showing the dynamic pressure type bearing device concerning the embodiment of the present invention. 動圧型軸受装置の組立工程を示す断面図である。It is sectional drawing which shows the assembly process of a dynamic pressure type bearing device. 動圧型軸受装置の組立工程を示す断面図である。It is sectional drawing which shows the assembly process of a dynamic pressure type bearing device.

符号の説明Explanation of reference numerals

１ 動圧型軸受装置
２ 軸部材
2ａ 軸部
７ ハウジング
７ａ 内周面
７ｂ 側部
７ｂ１ 装着部
７ｂ２ 段差面
７ｃ 底部
７ｃ１ 内面
７ｅ 鍔部
７ｅ１ 内周面
８ 軸受部材
８ｂ 下端面
１１ ラジアル軸受部
１２ スラスト軸受部
Ｓ３ スラスト軸受隙間
Ｓ４ スラスト軸受隙間
Ｓ５ ラジアル軸受隙間
Ｓ６ シール隙間 1 dynamic pressure bearing device 2 shaft member
2a Shaft 7 Housing 7a Inner peripheral surface 7b Side 7b1 Mounting part 7b2 Step surface 7c Bottom 7c1 Inner surface 7e Flange 7e1 Inner peripheral surface 8 Bearing member 8b Lower end 11 Radial bearing 12 Thrust bearing S3 Thrust bearing gap Clearance S5 Radial bearing clearance S6 Seal clearance

Claims (1)

円筒状の側部と、該側部の一端側部分に装着された蓋部材で構成される底部とを有するハウジングと、
軸部と、該軸部に設けられたスラスト板とを有する軸部材と、
前記ハウジングの内周面の所定位置に固定された軸受部材と、
前記軸部材の軸部の外周面と前記軸受部材の内周面との間に設けられ、ラジアル軸受隙間に発生する潤滑油の動圧作用で前記軸部をラジアル方向に非接触支持するラジアル軸受部と、
前記軸部材のスラスト板の両端面と、前記軸受部材の端面及び前記ハウジングの底部の内面との間に設けられ、スラスト軸受隙間に発生する潤滑油の動圧作用で前記スラスト板をスラスト方向に非接触支持するスラスト軸受部とを備え、
前記軸受部材の端面と前記ハウジングの底部の内面との間の軸方向寸法が定寸に形成されていることにより、前記スラスト軸受隙間が所定値に設定されている動圧型軸受装置。 A housing having a cylindrical side portion and a bottom portion configured by a lid member attached to one end portion of the side portion,
A shaft member having a shaft portion and a thrust plate provided on the shaft portion,
A bearing member fixed at a predetermined position on the inner peripheral surface of the housing;
A radial bearing that is provided between an outer peripheral surface of a shaft portion of the shaft member and an inner peripheral surface of the bearing member and that supports the shaft portion in a non-contact manner in a radial direction by a dynamic pressure action of lubricating oil generated in a radial bearing gap. Department and
The thrust plate is provided between the end surfaces of the thrust plate of the shaft member and the end surface of the bearing member and the inner surface of the bottom of the housing, and the thrust plate is moved in the thrust direction by a dynamic pressure action of lubricating oil generated in a thrust bearing gap. And a thrust bearing part for non-contact support,
A dynamic pressure bearing device wherein the axial dimension between the end surface of the bearing member and the inner surface of the bottom of the housing is formed to a fixed size, so that the thrust bearing gap is set to a predetermined value.
JP2004220659A 2004-07-28 2004-07-28 Dynamic pressure type bearing device Withdrawn JP2004308920A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007192369A (en) * 2006-01-20 2007-08-02 Jtekt Corp Performance determining method of dynamic pressure bearing and dynamic pressure bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007192369A (en) * 2006-01-20 2007-08-02 Jtekt Corp Performance determining method of dynamic pressure bearing and dynamic pressure bearing

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